The RP2040 Feather with USB Host lets us use Intellikeys with an iPad
the Intellikeys is a popular accessibility device with custom overlays, that is no longer supported. even though it has a USB plug it doesn't work like many USB devices: it doesn't enumerate as an HID keyboard, instead it downloads the firmware from the computer driver! that means it'll never work with many modern devices ike chromebooks or iPads...unless you've got a specialized device like the RP2040 Feather with two USB ports! we've loaded Thach's Intellikeys translator (
github.com/adafruit/Adafruit…) arduino sketch and it even does overlay detection so that when we switch out the paper it will enumerate as a different HID device. the code and hardware is all open source, so it can be maintained and improved for a very long time.